
from dataclasses import dataclass
from datetime import datetime
from wsgiref.handlers import format_date_time
from time import mktime
import hashlib
import base64
import hmac
from urllib.parse import urlencode
import json
import requests
from io import BytesIO, BufferedReader


STATUS_FIRST_FRAME = 0  # 第一帧的标识
STATUS_CONTINUE_FRAME = 1  # 中间帧标识
STATUS_LAST_FRAME = 2  # 最后一帧的标识

@dataclass
class TTSConfig:
    app_id: str
    api_key: str
    api_secret: str
    @property
    def common_args(self):
        return {"app_id": self.APPID}

class TTSServer:
    config: TTSConfig = None
    
    def __init__(self,content:str,language:str="chinese", config: TTSConfig = None,aue:str="raw",auf:str="audio/L16;rate=16000",vcn:str="xiaoyan",tte:str="utf8"):
        if config:
            TTSServer.config = config
        if TTSServer.config is None:
            raise Exception("config is None")
        self.BusinessArgs={"aue": aue, "auf": auf, "vcn": vcn, "tte": tte}
        self.content = content
        if language == "chinese":
            self.Data = {"status": 2, "text": str(base64.b64encode(self.Text.encode('utf-8')), "UTF8")}
        #使用小语种须使用以下方式，此处的unicode指的是 utf16小端的编码方式，即"UTF-16LE"”
        else:
            self.Data = {"status": 2, "text": str(base64.b64encode(self.Text.encode('utf-16')), "UTF8")}


    @classmethod
    # 生成url
    def create_url(cls):
        url = 'wss://tts-api.xfyun.cn/v2/tts'
        # 生成RFC1123格式的时间戳
        now = datetime.now()
        date = format_date_time(mktime(now.timetuple()))

        # 拼接字符串
        signature_origin = "host: " + "ws-api.xfyun.cn" + "\n"
        signature_origin += "date: " + date + "\n"
        signature_origin += "GET " + "/v2/tts " + "HTTP/1.1"
        # 进行hmac-sha256进行加密
        signature_sha = hmac.new(cls.config.api_secret.encode('utf-8'), signature_origin.encode('utf-8'),
                                 digestmod=hashlib.sha256).digest()
        signature_sha = base64.b64encode(signature_sha).decode(encoding='utf-8')

        authorization_origin = "api_key=\"%s\", algorithm=\"%s\", headers=\"%s\", signature=\"%s\"" % (
            cls.config.api_key, "hmac-sha256", "host date request-line", signature_sha)
        authorization = base64.b64encode(authorization_origin.encode('utf-8')).decode(encoding='utf-8')
        # 将请求的鉴权参数组合为字典
        v = {
            "authorization": authorization,
            "date": date,
            "host": "ws-api.xfyun.cn"
        }
        # 拼接鉴权参数，生成url
        url = url + '?' + urlencode(v)
        # print("date: ",date)
        # print("v: ",v)
        # 此处打印出建立连接时候的url,参考本demo的时候可取消上方打印的注释，比对相同参数时生成的url与自己代码生成的url是否一致
        # print('websocket url :', url)
        return url
    
    def stop(self):
        self.run = False
        if self.ws:
            self.ws.close()
            del self.ws
            print("ASR connection closed by stop")
            self.audio_buffer = None
            self.callbacks = None


    def create_asr_connection(self):
        """Create WebSocket connection to ASR service"""

        def on_message(ws, message):
            try:
                message =json.loads(message)
                code = message["code"]
                sid = message["sid"]
                audio = message["data"]["audio"]
                audio = base64.b64decode(audio)
                status = message["data"]["status"]
                print(message)
                if status == 2:
                    print("ws is closed")
                    ws.close()
                if code != 0:
                    errMsg = message["message"]
                    print("sid:%s call error:%s code is:%s" % (sid, errMsg, code))
                else:

                    with open('./demo.pcm', 'ab') as f:
                        f.write(audio)

            except Exception as e:
                print("receive msg,but parse exception:", e)

        # 收到websocket错误的处理
        def on_error(ws, error):
            print("### error:", error)


        # 收到websocket关闭的处理
        def on_close(ws):
            print("### closed ###")

        # 收到websocket连接建立的处理
        def on_open(ws):
            def run(*args):
                d = {"common": self.config.common_args,
                    "business": self.BusinessArgs,
                    "data": self.Data,
                    }
                d = json.dumps(d)
                print("------>开始发送文本数据")
                ws.send(d)
                if os.path.exists('./demo.pcm'):
                    os.remove('./demo.pcm')

            thread.start_new_thread(run, ())                    